Question

把合数写成一个质数加上两个质数的积的形式 (70)=()+()x()

Answer 1

70 = 5 + 5 × 13

70 = 13 + 3 × 19

70 = 19 + 3 × 17

70 = 31 + 3 × 13

70 = 37 + 3 × 11

70 = 61 + 3 × 3